Q.

With regard to ascending to high altitudes:

A. there is a linear decrease in inspired oxygen pressures with increasing altitude
B. the partial pressure of water vapour in moist inspired air decreases with PiO2
C. at 19,200m, barometric pressure = 47mmHg, PiO2 then is approx 9mmHg
D. at peak at Mt Everest, barometric pressure = 380mmHg, PiO2 is approx 70mmHg
E. in permanent residents of the Andes, arterial and venous PO2 is half normal levels
Answer» D. at peak at Mt Everest, barometric pressure = 380mmHg, PiO2 is approx 70mmHg
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